Plumbing provider Roto-Rooter, online florists 1-800-Flowers, e-commerce giant GSI Commerce, and theme park group Herschend Family Entertainment, whose attractions include the Dolly Parton-themed park Dollywood in Tennessee, are the four remaining companies participating in the first season of the series, the network said.
The new series follows a different executive each week who leaves the boardroom and goes anonymously to work on the frontlines of their own companies, discovering the operational flaws and the unsung heroes of their operations.
The CBS show, airing on Sundays, is the highest-rated new series of the 2009-2010 TV season averaging 18.74 million viewer per episode. CBS this week ordered a second season.
This week's episode will feature Bill Carstanjen, chief operating officer of horse racing company Churchill Downs, who will walk, wash and feed his organization's thoroughbred horses.